M Cloth Glass & Window is made from millions of tightly woven high density microfibres, which quickly remove dirt and grease from windows and other glass surfaces. It's generous size makes light work of large surface areas, leaving a crystal clear finish every time. How does it work? Microscopic fibres clean brilliantly well, they have significantly greater contact with the surface they are cleaning and create a powerful capillary action to absorb away dirt and moisture.